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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8625b5925093e2d0094228a16d791d6f8a8b625afcdd9a8e71bfa52a6a8191f8' 
  AND token = 'OyLOeBaFSB7s4w3t1g6uLx1RxcXvSYVadTavILUs34c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}